Logically it will do something because I actually saw a difference (small of course) in acceleration. The gas is more airy and I have refilled it twice since then. And I compare it to a similar product I had bought from the store and I hadn't seen any difference. I would definitely buy it again. I should note that the instructions say one bottle for every 5 liters of fuel. When I used it (only one), I had about 15-20 liters. Despite that, there was an improvement.